参数
说明
url
请求地址
type
请求类型
data
请求参数
dataType
返回参数
success
成功处理函数
error
错误处理函数
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-3.4.1.min.js" ></script>
<script type="text/javascript">
$(function(){
//强调:基于javascript实现的ajax用法,比较繁琐,不需要掌握
//需要掌握的是基于jQuery方式使用的Ajax
//当用户登录,输入用户名后,失去焦点,校验登录用户名再系统中是否被使用
$("#uname").blur(function(){
//alert($(this).val());
//获取输入的用户名,并实现非空校验
var userName = $(this).val();
if(userName == null || userName == ""){
alert("用户名不能为空");
return;
}
//基于jAuery的Ajax用法-基本用法
$.ajax({
"url" : "<%=request.getContextPath()%>/checkUserName",
"type" : "post",
"data" : {"userName" : userName},
"dataType" : "text",
"success" : function(data){
//alert(JSON.parse(data));
if(JSON.parse(data)){
$("#showMsg").html("用户名存在").css({"color":"red"});
}else{
$("#showMsg").html("用户名可用").css({"color":"#2ceb0a"});
}
},
"error" : function(){
$("#showMsg").html("未知错误");
}
});
</script>
语法:$.get(url,params,success)
;
//基于JQuery的Ajax用法-扩展用法1,简写Get方,Ajax请求
//语法:$.get(url,params,success)
$.get("<%=request.getContextPath()%>/checkUserName",{"userName":serName},function(data){
if(JSON.parse(data)){
$("#showMsg").html("用户名存在get").css({"color":"red"});
}else{
$("#showMsg").html("用户名可用get").css({"color":"#2ceb0a"});
}
});
语法:$.post(url,params,success)
;
//基于JQuery的Ajax用法-扩展用法1,简写Get方,Ajax请求
//语法:$.post(url,params,success)
$.post("<%=request.getContextPath()%>/checkUserName",{"userName" : userName},function(data){
if(JSON.parse(data)){
$("#showMsg").html("用户名存在post").css({"color":"red"});
}else{
$("#showMsg").html("用户名可用post").css({"color":"#2ceb0a"});
}
});
checkUserName 对应的处理代码;通过Response返回结果,前端接收到结果并进行处理;
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//后台接收用户名,校验是否重复
//获取用户参数
String userName = req.getParameter("userName");
System.out.println("AjaxServlet userName=>>"+userName);
//定义返回的结果
boolean result= false;
//模拟调用业务,查询当前用户名再数据中是否有记录
List<String> userNames = Arrays.asList("kh96","kgc","Ajax");
if(userNames.contains(userName)) {
result = true;
}
//异步请求响应结果,注意println不可以用,返回的结果会带\n
System.out.println("AjaxServlet result==>"+result);
resp.getWriter().println(result);
}
loginAnime.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<meta charset="UTF-8">
<title>登录页面</title>
<style type="text/css">
table{
background-color:pink;
}
</style>
</head>
<body>
<form action="<%=request.getContextPath()%>/loginAnime" method="get">
<table border="1px" align="center" width="40%" cellspacing="0">
<tr style="hight:60px; font-size:16px;background-color:#B9DEE0">
<th colspan="2"> 欢迎登录课工场KH96动漫管理系统 </th>
</tr>
<tr>
<td>用户名:</td>
<td>
<input type="text" name="uname" id="uname" placeholder="请输入"用户名> </input>
<span id = "showMsg" style="text-align:center;"></span>
</td>
</tr>
<tr>
<td>用户密码:</td>
<td>
<input type="password" name="upwd" id="upwd" placeholder="请输入用户密码"> </input>
</td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" value="立即登录" />
<input type="reset" value="重新填写" />
</td>
</tr>
</table>
</form>
</body>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-3.4.1.min.js" ></script>
<script type="text/javascript">
$(function(){
$("#uname").blur(function(){
//异步请求校验用户名
//基于jAuery的Ajax用法-基本用法
$.post("<%=request.getContextPath()%>/checkUserName",{"userName" :$("#uname").val()},function(data){
if(JSON.parse(data)){
$("#showMsg").html("用户名存在").css({"color":"#2ceb0a"});
}else{
$("#showMsg").html("用户名不存在").css({"color":"red"});
}
});
});
$("form").submit(function(){
//用户名非空校验
var userName = $("#uname").val();
//alert(userName);
if(userName == null || userName == ""){
alter("用户名不能为空");
//submi事件,接收false结果,会自动取消表单的提交
return false;
}
//密码非空
var userPwd = $("#upwd").val();
//alert(userPwd);
if(userPwd == null || userPwd == ""){
alter("用户密码不能为空");
//submi事件,接收false结果,会自动取消表单的提交
return false;
}
//异步提交登录请求,如果交谈用户信息输入正确,提示登录成功,宁跳转到动漫管理首页,否则提示登录失败
$.post("<%=request.getContextPath()%>/loginAnime",{"userName" : userName,"userPwd":userPwd},function(data){
if(JSON.parse(data)){
alert("登录成功");
//请求后台获取动漫列表数据
//location.href = "<%=request.getContextPath()%>/animes";
//请求列表页面,使用Ajax解析json数据
location.href = "animeListJson.jsp";
}else{
alert("登录失败");
}
});
//由于使用了Ajax进行了异步登录请求,此处表单就不能再提交,否者表达再提交会出错
return false;
});
});
</script>
</html>
注意:
再使用Ajaz提交表单时,一定要返回false,要不然表单会再提交一次;
AnimeServlet
public class AnimeServlet extends HttpServlet {
private static final long serialVersionUID = -4726403189879316484L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 模拟从数据库获取动漫列表
List<Animes> animes = new ArrayList<>();
animes.add(new Animes(961, "玄幻", "斗破苍穹", "土豆", "萧炎", "玄机科技", "2019-08-04"));
animes.add(new Animes(962, "玄幻", "完美世界", "辰东", "石昊", "福煦影视", "2020-08-05"));
animes.add(new Animes(963, "言情", "狐妖小红娘", "小新", "白月初", "腾讯动漫", "2021-08-06"));
animes.add(new Animes(964, "言情", "秦时明月", "温世仁", "天明", "玄机科技", "2022-08-04"));
animes.add(new Animes(965, "热血", "镇魂街", "许辰", "曹焱兵", "卢李工作室", "2018-08-04"));
animes.add(new Animes(966, "热血", "雾山五行", "林魂", "闻人翊悬", "六道无鱼", "2018-08-04"));
//将动漫集合放入request作用域
req.setAttribute("animes", animes);
//转发到动漫列表页面
req.getRequestDispatcher("web5AjaxAndJquery/animeList.jsp").forward(req, resp);
}
}
public class AnimeJsonServlet extends HttpServlet {
private static final long serialVersionUID = -4726403189879316484L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 模拟从数据库获取动漫列表
List<Animes> animes = new ArrayList<>();
animes.add(new Animes(961, "玄幻", "斗破苍穹", "土豆", "萧炎", "玄机科技", "2019-08-04"));
animes.add(new Animes(962, "玄幻", "完美世界", "辰东", "石昊", "福煦影视", "2020-08-05"));
animes.add(new Animes(963, "言情", "狐妖小红娘", "小新", "白月初", "腾讯动漫", "2021-08-06"));
animes.add(new Animes(964, "言情", "秦时明月", "温世仁", "天明", "玄机科技", "2022-08-04"));
animes.add(new Animes(965, "热血", "镇魂街", "许辰", "曹焱兵", "卢李工作室", "2018-08-04"));
animes.add(new Animes(966, "热血", "雾山五行", "林魂", "闻人翊悬", "六道无鱼", "2018-08-04"));
//将集合数据,转换为json字符串,返回给前端
//阿里巴巴的fasejson,将集合转换为json字符串
String animesJson = JSON.toJSONString(animes);
System.out.println(animesJson);
//响应
resp.setContentType("text/html;charset=UTF-8");
resp.setCharacterEncoding("UTF-8");
resp.getWriter().print(animesJson);
}
}
animeList.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!-- 核心标签库 -->
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!-- 格式化标签库 -->
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>动漫主页</title>
</head>
<body>
<h2 style="text-align: center">课工场KH96班动漫管理系统</h2>
<p style="text-align: center">
名称:<input type="text" name="animeName" size="15"/>
作者:<input type="text" name="animeAuthor" size="15"/>
分类:<select name="animeCategory">
<option value="0">全部</option>
<option value="1">玄幻</option>
<option value="2">武侠</option>
<option value="3">言情</option>
<option value="4">机甲</option>
</select>
<input type="button" value = "搜索"/>
</p>
<table border="1px" width="90%" cellspacing="0" align="center">
<thead>
<tr style="height: 80px; font-size: 30px; background-color: cyan;">
<th colspan="8">动漫详情列表</th>
</tr>
<tr>
<th colspan="8" style="text-align: right;">欢迎: <a href="logout">退出登录</a></th>
</tr>
<tr style="height: 40px; background-color: cyan;">
<th>编号</th>
<th>分类</th>
<th>名称</th>
<th>作者</th>
<th>主角</th>
<th>出品</th>
<th>时间</th>
<th>操作</th>
</tr>
</thead>
<tbody>
<!-- tbody中是动态加载的数据列表 -->
<c:forEach items="${animes}" var ="anime" varStatus="status">
<tr align="center"
<c:if test="${status.index % 2 == 1 }">
style = "background-color: pink;"
</c:if>
>
<td>${anime.animeId }</td>
<td>${anime.animeCategory } </td>
<td>${anime.animeNaem } </td>
<td>${anime.animeAuthor } </td>
<td>${anime.animeActor } </td>
<td>${anime.animeProduce } </td>
<td>${anime.animeTime } </td>
<td>
<a href="#">修改</a> |
<a href="#">删除</a>
</td>
</tr>
</c:forEach>
</tbody>
<tfoot>
<tr>
<td colspan="8" style="height: 40px; text-align: center">
<input type="button" value="添加" id="addAnime"/>
<a href="#">首页</a> |
<a href="#"><<上一页</a> |
<a href="#">下一页>></a> |
<a href="#">尾页</a> |
共 6 条 每页 10 条 当前第 1 页 / 共 1 页
</td>
</tr>
</tfoot>
</table>
</body>
</html>
animeListJson.jsp
//tbody部分
<tbody>
<!-- 直接通过jQuery添加子标签 -->
</tbody>
//处理成功返回的数据部分
"success": function(data){
//确定数据动态显示的位置
var $tbody = $("tbody");
//alert(data);
//数据解析
// 隔行变色
var count = 1;
// 数据解析
$(data).each(function(){
// 定义颜色
var bgColor = count % 2 == 0 ? "style='background-color:#ddd;'" : "";
$("tbody").append(
"<tr align='center' " + bgColor + ">"
+ "<td>" + this.animeId + "</td>"
+ "<td>" + this.animeCategory + "</td>"
+ "<td>" + this.animeName + "</td>"
+ "<td>" + this.animeAuthor + "</td>"
+ "<td>" + this.animeActor + "</td>"
+ "<td>" + this.animeProduce + "</td>"
+ "<td>" + this.animeTime + "</td>"
+ "<td><a href='#'>修改</a> <a href='#'>删除</a></td>"
+ "</tr>"
);
count++;
});
}
展示效果:
手机扫一扫
移动阅读更方便
你可能感兴趣的文章